#include <bits/stdc++.h>
using namespace std;

string decToSci(double n) {
  ostringstream oss;
  int exp = 0;
  
  while (abs(n) >= 10) {
    n /= 10;
    exp++;
  }
  
  while (abs(n) < 1) {
    n *= 10;
    exp--;
  }

  oss << n << ((exp == 0) && (n == static_cast<int>(n)) ? ".0" : "") << "e" << (exp > 0? "+" : "") << exp;

  string result = oss.str();
  return result;
}

int charToInt(char c) {
    return c - '0';
}

int main() {
  int t;
  cin >> t;
  
  unordered_map<char, string> map = {
    {'0', "zer"},
    {'1', "one"},
    {'2', "two"},
    {'3', "thr"},
    {'4', "fou"},
    {'5', "fiv"},
    {'6', "six"},
    {'7', "sev"},
    {'8', "eig"},
    {'9', "nin"}
  };
  
  while (t > 0) {
    double n;
    string str;
    cin >> n >> str;
    
    string sn = decToSci(n);
    int sum = 0;
    string final = "";
    
    int count = 0;
    for (int i = 0; i < sn.length(); i++) {
      if (sn[i] == '-') {
        final.append(1, sn[0]);
      } 
      else if (sn[i] == '.') {
        i++;
        while (sn[i] != 'e') {
          int x = charToInt(sn[i]);
          // cout << x << " ";
          sum += x;
          i++;
        }
        
        // cout << sum << endl;
        int temp = 0;
        if (sum / 10 != 0) {
          while (sum != 0) {
            int rem = sum % 10;
            // cout << rem << " ";
            temp += rem;
            sum /= 10;
          }
        }
        sum = temp;
        // cout << sum << endl;
        
        // strcat(final, map[static_cast<char>(sum)]);
        string s = map[static_cast<char>('0' + sum)];
        // cout << "--- " << static_cast<char>('0' + sum) << " ---" << endl;
        final.append(s);
      }
      else if (charToInt(sn[i]) >= 1 && charToInt(sn[i]) <= 26) {
        // strcat(final, map[static_cast<char>(sn[i])]);
        string s = map[sn[i]];
        // cout << "--------- " << s <<  " ---------" << endl;
        final.append(s);
      } else {
        if (sn[i] != '+' || sn[i] != '-') {
          cout << "Invalid Input" << endl;
          break;
        }
      }
      // count++;
    }
    
    // cout << sn << endl << final << endl << count << endl;
    
    t--;
  }
  
  return 0;
}

C++ Online Compiler

Write, Run & Share C++ code online using OneCompiler's C++ online compiler for free. It's one of the robust, feature-rich online compilers for C++ language, running on the latest version 17. Getting started with the OneCompiler's C++ compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as C++ and start coding!

Read inputs from stdin

OneCompiler's C++ online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.

#include <iostream>
#include <string>
using namespace std;

int main() 
{
    string name;
    cout << "Enter name:";
    getline (cin, name);
    cout << "Hello " << name;
    return 0;
}

About C++

C++ is a widely used middle-level programming language.

  • Supports different platforms like Windows, various Linux flavours, MacOS etc
  • C++ supports OOPS concepts like Inheritance, Polymorphism, Encapsulation and Abstraction.
  • Case-sensitive
  • C++ is a compiler based language
  • C++ supports structured programming language
  • C++ provides alot of inbuilt functions and also supports dynamic memory allocation.
  • Like C, C++ also allows you to play with memory using Pointers.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition If-Else is used.

if(conditional-expression) {
   //code
}
else {
   //code
}

You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression){    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
......    
    
default:     
 code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  //code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while (condition) {  
// code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
 // code 
} while (condition);

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.

How to declare a Function:

return_type function_name(parameters);

How to call a Function:

function_name (parameters)

How to define a Function:

return_type function_name(parameters) {  
 // code
}